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Old 01-11-2001, 11:48 PM   #1
Eric SS
Sooby Guru
 
Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2013 335i, 2011 G37 coupe
Vehicle:
2000 2.5RS w/ EJ22T
swap and N20. gone. : (

Post What I learned at the dragstrip with other RS's (kinda long)

Well, about 5 of us Phoenix guys met up at the dragstrip last night for some fun. There was a 99RS, a 2000 Sedan RS, my 2000 Coupe RS, an SVX, and a Turbo SVX.

1) I learned that some cars are just faster than others from the factory. The 2000 Sedan ran a best of 15.3x with only a Stromung dual tip and a Ganzflow intake. The best I could offer was a 15.98 with a Stromung, K&N, and S-AFC. I let Curt (MY00 Sedan) drive my car and I drove his with comparible results so it's not the driver.

2) my S-AFC is useless. I tried everything from +5% all the way across to -15% all the way across and ran almost identical times. And yes it is working. I get a CE light when I run it at -10% (or anything for that matter) all the time.

3)I ran my car without the Ganzflow and with the Ganzflow and ran again almost identical times. Conclusion: The ganzflow did nothing on for my car. That's not to say it won't do anything for EVERY car. Just mine.

4) Nitrous is the only way for me to beat any other Impreza on the road. I've run a 14.70 (with 50hp shot) but could only run a 14.9x with it last night.

Needless to say I'm quite upset that my car is a pig from the factory but what can I do about it? nothing, so whatever...

Eric

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Old 01-11-2001, 11:50 PM   #2
tom@kartboy
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the competition.

Post

did you do a ECU reset between all of these different combinations?
just wonderin
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Old 01-11-2001, 11:52 PM   #3
RidinLow
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Yeah, some cars are just slower than others from the factory. In high school I had a 1990 automatic Legend coupe with 50k mi. My friend had a 1990 automatic Legend sedan with 50k mi and he could walk away from me with 4 people in his car & just 140 lb me in mine! Both cars were completely stock.
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Old 01-11-2001, 11:53 PM   #4
Eric SS
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Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2013 335i, 2011 G37 coupe
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2000 2.5RS w/ EJ22T
swap and N20. gone. : (

Post

No I didn't do an ECU reset but I'm pretty skeptical on the whole ECU reset thing.

I'm pretty sure at Wide Open Throttle our cars use a set Fuel curve that can't be changed by reseting the ECU. The ECU reset thing is for daily driving IIRC

Eric
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Old 01-12-2001, 03:01 AM   #5
slamck
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'03 LLBean, '05 B4

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I think reseting the ECU has more to do with ignition timing than feul mapping. I always feel the car runs stronger after ECU reset.
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Old 01-12-2001, 03:11 AM   #6
Eric SS
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Location: 2013 335i, 2011 G37 coupe
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2000 2.5RS w/ EJ22T
swap and N20. gone. : (

Post

I guess I'll try it next time I go to the strip... you guys are starting to convince me even though I'm still Skeptical

Eric
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Old 01-12-2001, 04:12 AM   #7
ivbdn
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Post

I'm not sure what resetting the ECU does, but I know it does wonders for the car after adding mods like an intake, exhuast, etc.

I too have a Ganzflow and didn't think much of it until I reset the ECU. I highly suggest you try it.
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Old 01-12-2001, 04:22 AM   #8
BongMan
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Yea you need to reset the ECU. If you don't and have the CE light on, then forget it. You ain't gonna pull away from anyone. Other factors that could cause different timeslips are temp, slipping clutch, maintainance, but i would imagine these weren't a factor in your dilema. When your car has the CE light on it will fires less often and wastes more fuel. This will retard your timing, thus retarding your car.
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Old 01-12-2001, 03:17 PM   #9
Eric SS
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Location: 2013 335i, 2011 G37 coupe
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2000 2.5RS w/ EJ22T
swap and N20. gone. : (

Post

I didn't have the CE light on. It only comes on when I set the AFC for cruising speeds. Not for Full throttle.

Eric
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Old 01-12-2001, 03:28 PM   #10
ColinL
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Eric, did you happen to ask the others 1) what sort of gas they are using and 2) what kind of plugs (including heat range) they have?

Otherwise you may be on the low end of the tolerance curve...
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Old 01-12-2001, 03:36 PM   #11
Eric SS
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Location: 2013 335i, 2011 G37 coupe
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2000 2.5RS w/ EJ22T
swap and N20. gone. : (

Post

The Other car has stock Plugs. It has 6,000 miles on it and mine has 5,000 miles on it.

He was running a mix of 101 and 92 octane and I was running straight 92 but will octane give you 7/10th?? no way!

However, I believe the problem is this: When I look at his exhaust tips, They are spotless. No sign of running rich. Mine are black as can be! So, I need t ofigure out how to set my car up not to run rich I guess!

Just so I know, when you set the AFC to -10%, it takes OUT fuel right?

Eric
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Old 01-12-2001, 03:49 PM   #12
ColinL
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'01 Erion CBR 929

Post

Correct. The ganzflow intake keeps the torque chamber, right? (black box on the throttle body.)
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Old 01-12-2001, 03:50 PM   #13
Eric SS
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Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2013 335i, 2011 G37 coupe
Vehicle:
2000 2.5RS w/ EJ22T
swap and N20. gone. : (

Post

Yes it does.

Eric
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Old 01-12-2001, 03:53 PM   #14
ColinL
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'03 Evo, Rice White
'01 Erion CBR 929

Post

I would get one step hotter plugs, something like NGK copper. Use the 99 plug spec, it is an NGK "5". 00-01 spec an NGK "7" for some reason, probably fuel mapping and slightly different CR.

Wait... are you running colder plugs because of the juice?
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Old 01-12-2001, 03:56 PM   #15
Kevin Thomas
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Post

Imprezinator,

If you have time, send me your results so I can post it up on my page. I'll have it at least until your runs get better in case you lose the slip.

On another note, I switched back and forth 3 different times at the dragstrip using different octane (When I was N/A) and my times actually got WORSE using 92 octane, even after the ECU reset. This was with an intake and exhaust. El Cheapo 87 octane worked just fine. Yuck!

[This message has been edited by Kevin Thomas (edited January 12, 2001).]
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